Calculation method for charging duration and calculation method for total remaining charging duration of battery

Abstract

The present application provides a method for calculating the charging duration and a method for calculating the total remaining charging duration of a battery. The method for calculating the charging duration includes: obtaining the charging parameters of the battery, establishing a charging model based on the charging parameters, where the charging model includes multiple charging stages; obtaining the current operating condition parameters of the battery in the current charging stage, and determining the stage charging current of the battery according to the current operating condition parameters and the charging model; determining the current charging stage and related charging parameters of the battery according to the stage charging current of the battery; and calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the related charging parameters. By establishing a model of the charging stage through the above method, dynamically capturing the change in the stage charging current caused by the change in the charging operating condition, so as to accurately obtain the charging duration and the total remaining charging duration of the current charging stage, which is convenient for the user to reasonably arrange the itinerary.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a method for calculating charging duration and a method for calculating the total remaining charging duration of a battery. Background Art

[0002] A battery refers to a device that can be charged by an external power supply and has the characteristic of being reusable. It is charged by an external power supply to convert electrical energy into chemical energy for storage, and then the chemical energy is converted back into electrical energy for use by the device when needed.

[0003] Batteries are widely used. A battery is an important energy storage device for electric vehicles and hybrid electric vehicles, providing a persistent energy supply and efficient power output. Batteries play an important role in grid energy storage systems, where they can store excess electrical energy and release it when needed to balance grid loads, respond to sudden demands, or address power supply instability. Batteries are used as power sources in portable electronic devices such as smartphones, tablets, and laptops. Batteries are also widely used in fields such as aerospace, medical equipment, and wireless communication base stations.

[0004] The estimation of the remaining charging time is one of the important parameters of the charging time and directly affects the user experience. However, existing estimation methods only calculate based on the current charging state and current. However, during the actual charging process of the battery, the charging current may increase or decrease due to different environments, and accordingly, the estimated charging duration is extremely inaccurate, unable to provide good charging guidance for users, resulting in a poor user experience. Summary of the Invention

[0005] In view of the above problems, this application provides a method for calculating charging duration and a method for calculating the total remaining charging duration of a battery, which overcomes the above problems or at least partially solves the problem of accurately estimating the charging duration of the battery.

[0006] According to one aspect of the embodiments of this application, a method for calculating charging duration is provided, which is applied to a battery. The method includes: Step A, obtaining the charging parameters of the battery and establishing a charging model based on the charging parameters, where the charging model includes multiple charging stages; Step B, obtaining the current working condition parameters of the battery in the current charging stage, and determining the stage charging current of the battery based on the current working condition parameters and the charging model; Step C, determining the charging stage in which the battery is located in the charging model based on the stage charging current of the battery, and determining relevant charging parameters; Step D, calculating the charging duration of the battery in the current charging stage based on the stage charging current of the battery and the relevant charging parameters.

[0007] In an alternative approach, in step A: the charging parameters include the charging current and the battery temperature, and the charging model includes a first model, which is a relationship model established based on the charging current and the battery temperature; in step B: the current operating condition parameters include the starting battery temperature and the external input current limit; the corresponding theoretical temperature current is determined according to the starting battery temperature and the first model, and the smaller value between the theoretical temperature current and the external input current limit is used as the stage charging current of the battery; step C includes: determining the charging stage in which the battery is located in the first model according to the stage charging current of the battery, and determining first relevant charging parameters, where the first relevant charging parameters include: the cut-off battery temperature of the current charging stage; step D includes: obtaining a battery temperature rise rate table, and obtaining the temperature rise rate of the current charging stage according to the battery temperature rise rate table, the starting battery temperature, and the stage charging current; calculating a first duration as the charging duration of the current charging stage according to the temperature rise rate, the starting battery temperature, and the cut-off battery temperature.

[0008] In an alternative approach, in step A: the charging parameters include the charging current and the battery SOC, and the charging model includes a second model, which is a relationship model established based on the charging current and the battery SOC; in step B: the current operating condition parameters include the starting battery SOC and the external input current limit; the corresponding theoretical SOC current is determined according to the starting battery SOC and the second model, and the smaller value between the theoretical SOC current and the external input current limit is used as the stage charging current of the battery; step C includes: determining the charging stage in which the battery is located in the second model according to the stage charging current of the battery, and determining second relevant charging parameters, where the second relevant charging parameters include: the cut-off battery SOC of the current charging stage; step D includes: obtaining the rated capacity of the battery; calculating a second duration as the charging duration of the current charging stage according to the rated capacity, the starting battery SOC, the cut-off battery SOC, and the stage charging current.

[0009] In an alternative approach, in step A: the charging parameters include charging current, battery temperature, and battery SOC; the charging model includes a first model and a second model. The first model is a relational model established based on the charging current and battery temperature, and the second model is a relational model established based on the charging current and battery SOC. In step B: the current operating condition parameters include the starting battery temperature, starting battery SOC, and external input current limit. The corresponding theoretical temperature current is determined according to the starting battery temperature and the first model, and the corresponding theoretical SOC current is determined according to the starting battery SOC and the second model. The minimum value among the theoretical temperature current, theoretical SOC current, and external input current limit is used as the stage charging current of the battery. Step C includes: determining the charging stage in which the battery is located in the first model according to the stage charging current of the battery, and determining the first relevant charging parameters. The first relevant charging parameters include: the cut-off battery temperature corresponding to the current charging stage. Determining the charging stage in which the battery is located in the second model according to the stage charging current of the battery, and determining the second relevant charging parameters. The second relevant charging parameters include: the cut-off battery SOC corresponding to the current charging stage. Step D includes: obtaining a battery temperature rise rate table, and obtaining the temperature rise rate of the current charging stage according to the battery temperature rise rate table, the starting battery temperature, and the stage charging current. Calculating the first duration according to the temperature rise rate, starting battery temperature, and cut-off battery temperature. Obtaining the rated capacity of the battery. Calculating the second duration according to the rated capacity, starting battery SOC, cut-off battery SOC, and stage charging current. The smaller value of the first duration and the second duration is used as the charging duration of the current charging stage.

[0010] In an alternative approach, step D further includes obtaining the charging efficiency of the battery; calculating the second duration according to the charging efficiency, rated capacity, starting battery SOC, cut-off battery SOC, and stage charging current.

[0011] In an alternative approach, the calculation formula for the first duration is:

[0012]

[0013] wherein, the is the first duration of the n th charging stage, the is the cut-off battery temperature of the n th charging stage, the is the starting battery temperature of the n th charging stage, and the is the n corresponding temperature rise rate of the

[0014]

[0015] Among them, the is the temperature rise rate limited by the temperature range and the charging current The is the temperature rise rate limited by the temperature range and the charging current The I n is the stage charging current of the n th charging stage. The and are the two ends of the charging current range where the I n is located.

[0016] In an alternative manner, the cut-off battery temperature of the current charging stage is equal to the starting battery temperature of the next charging stage. The method for obtaining the starting battery temperature of the next charging stage includes: obtaining the starting battery temperature, charging duration, and temperature rise rate of the current charging stage; calculating the starting battery temperature of the next charging stage according to the starting battery temperature, charging duration, and temperature rise rate of the current charging stage.

[0017] In an alternative manner, the calculation formula for the starting battery temperature of the next charging stage is:

[0018]

[0019] Among them, is the starting battery temperature of the next charging stage, is the starting battery temperature at the start of the current charging stage, is the charging duration of the current charging stage, is the temperature rise rate of the current charging stage.

[0020] In an alternative manner, the calculation formula for the second duration is:

[0021]

[0022] Among them, the is the second duration of the n th charging stage. The is the cut-off battery SOC of the n th charging stage. The is the starting battery SOC of the n th charging stage. The is the rated capacity. The is the stage charging current of the n th charging stage, and the is the charging efficiency.

[0023] In an alternative manner, the cut-off battery SOC of the current charging stage is equal to the starting battery SOC of the next charging stage. The method for obtaining the starting battery SOC of the next charging stage includes: obtaining the stage charging current, charging duration, and starting battery SOC of the current charging stage; calculating the starting battery SOC of the next charging stage according to the stage charging current, charging duration, and starting battery SOC.

[0024] In an alternative manner, the calculation formula for the starting battery SOC of the next charging stage is:

[0025]

[0026] where is the cut-off battery SOC at the end of the current charging stage, is the starting battery SOC at the start of the current charging stage, is the stage charging current of the current charging stage, is the charging duration of the current charging stage, is the charging efficiency, is the rated capacity of the battery.

[0027] According to one aspect of the embodiments of the present application, a method for calculating the total remaining charging duration of a battery is provided. The method includes: obtaining the charging durations of each charging stage according to the above-mentioned charging duration calculation method to obtain a plurality of charging durations; accumulating the plurality of charging durations to obtain the total remaining charging duration of the battery.

[0028] According to one aspect of the embodiments of the present application, a charging duration calculation device is provided, which is applied to a battery. The device includes: a first acquisition module for acquiring the charging parameters of the battery and establishing a charging model according to the charging parameters, where the charging model includes a plurality of charging stages; a second acquisition module for acquiring the current operating condition parameters of the battery in the current charging stage and determining the stage charging current of the battery according to the current operating condition parameters and the charging model; a determination module for determining the charging stage in which the battery is located in the charging model according to the stage charging current of the battery and determining relevant charging parameters; a calculation module for calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters.

[0029] According to one aspect of the embodiments of the present application, a battery system is provided. The battery system includes: at least one processor, and a memory communicatively connected to the at least one processor. The memory stores instructions executable by the at least one processor. When the instructions are executed by the at least one processor, the at least one processor is enabled to execute the method as described above.

[0030] According to one aspect of the embodiments of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes the steps of the above method.

[0031] The beneficial effects of the present application include: By establishing a model for the charging stage, dynamically capturing the changes in the charging current caused by the changes in the battery SOC and / or battery temperature, so as to more accurately estimate the charging duration and the remaining charging duration of the current charging stage of the battery. This method adapts to the phenomenon of charging condition fluctuations caused by changes in the ambient temperature and the battery SOC during the charging process, improves the estimation accuracy of the remaining charging time, and greatly improves the user experience. Description of the Drawings

[0032] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the figures do not constitute a proportional limitation.

[0033] Figure 1 is a schematic diagram of a system provided by an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the hardware structure of the BMS module provided by an embodiment of the present application;

[0035] Figure 3 is a schematic flowchart of a method for calculating the charging duration provided by an embodiment of the present application;

[0036] Figure 4 is a schematic diagram of the model relationship of the first model provided by an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of the model relationship of the second model provided by an embodiment of the present application;

[0038] Figure 6 is a schematic flowchart of calculating the first duration provided by an embodiment of the present application;

[0039] Figure 7 is a schematic diagram of the difference in the battery temperature rise rate under different currents in the same temperature range provided by an embodiment of the present application;

[0040] Figure 8 is a schematic flowchart for calculating the second duration provided by an embodiment of the present application;

[0041] Figure 9 is a schematic flowchart for calculating the operating condition parameters at the end of the current charging stage provided by an embodiment of the present application;

[0042] Figure 10 is a schematic diagram of a calculation device for the charging duration provided by an embodiment of the present application. Detailed implementation manners

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0044] In addition, the technical features involved in the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] Please refer to Figure 1 , Figure 1 is a schematic diagram of a system provided by an embodiment of the present application, and the system is applicable to the charging duration calculation method and the charging duration calculation device. The system includes a battery 100 and a BMS module 200. The battery 100 can specifically have various setting manners, not limited to Figure 1 the situation shown.

[0046] The battery 100 may only include a single battery cell 10, that is, the battery 100 is formed by the single battery cell 10.

[0047] The battery 100 may include multiple battery cells 10, and the multiple battery cells 10 are connected in series or in parallel.

[0048] The battery 100 may also include multiple sets of electrochemical devices, and one set of the electrochemical devices includes multiple battery cells 10, and the multiple battery cells 10 are connected in series or in parallel.

[0049] The battery 100 can be a lithium-ion battery, which mainly includes consumer batteries, power batteries, and energy storage batteries. Among them, consumer batteries usually require small size, light weight, high energy density, and long cycle life, and are widely used in personal electronic devices such as mobile phones, laptops, tablets, digital cameras, and portable music players. Among them, power batteries are mainly used in transportation tools such as new energy vehicles, electric bicycles, and electric trains to provide the instantaneous high power output required by the vehicle to support operations such as acceleration and climbing. Among them, energy storage batteries are mostly used as battery energy storage systems for renewable energy such as solar energy, wind energy, and hydropower, as well as in scenarios such as power grid peak shaving and frequency modulation, backup power supplies, and microgrids, mainly for long-term energy storage and stable release.

[0050] It can be understood that in some embodiments, the system further includes a BMS (Battery Management System) module 200, and the BMS module 200 is responsible for monitoring the operating state of the battery 100 to ensure the safe and reliable operation of the battery 100. The BMS module 200 can monitor and collect the state parameters of the battery 100 in real time (including but not limited to the voltage, current, temperature, insulation resistance, etc. of the battery 100), and perform necessary analysis and calculations on the relevant state parameters to obtain more state evaluation parameters, and realize effective control of the battery 100 according to specific protection control strategies to ensure the safe and reliable operation of the entire battery 100. At the same time, the BMS module 200 can perform information interaction with other external devices 300 (PCS, EMS, fire protection systems, etc.) through its own communication interface and analog / digital input interface to form a linkage control to ensure the safe, reliable, and efficient operation of the battery 100.

[0051] To solve the technical problem in the prior art that the remaining charging duration of the battery cannot be accurately calculated, the embodiments of the present application provide a method for calculating the charging duration.

[0052] Embodiment 1

[0053] Before introducing the method for calculating the charging duration in detail, the hardware structure of the BMS module 200 provided by the embodiments of the present application will be described.

[0054] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the hardware structure of the BMS module 200 provided by the embodiments of the present application, and it can execute the method for calculating the charging duration and the method for calculating the total remaining duration of the battery. The BMS module 200 includes at least one processor 21 and a memory 22 connected in communication ( Figure 2 connected by a bus and taking one processor as an example). Those of ordinary skill in the art can understand that, Figure 2The structure shown is only schematic and does not limit the structure of the above battery. For example, the BMS module 200 may also include more or fewer components than those shown in Figure 2 or have a different configuration from that shown in Figure 2 .

[0055] Wherein, the processor 21 is used to provide computing and control capabilities, control the BMS module 200 to execute any method provided by the following application embodiments, and then perform corresponding management on the battery 100.

[0056] It can be understood that the processor 21 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0057] The memory 22, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs and modules, such as program instructions / modules corresponding to various calculation methods in the embodiments of the present application. By running the non-transitory software programs, instructions and modules stored in the memory 22, the processor 21 can implement the various calculation methods in any of the following method embodiments. The memory 22 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 22 may also include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor through a network. Examples of the above networks include, but are not limited to, the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0058] Embodiment 2

[0059] The embodiment of the present application also provides a non-volatile computer-readable storage medium, and the non-volatile computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by the battery to implement the various calculation methods in any of the following method embodiments.

[0060] An embodiment of the present application provides a computer program product, including a computing program stored on a non-volatile computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to execute each computing method in any of the following method embodiments.

[0061] Through the description of the above embodiments, those of ordinary skill in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, and of course, it can also be implemented by hardware. Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0062] Embodiment III

[0063] Hereinafter, a method for calculating the charging duration provided by the embodiments of the present application will be discussed. Among them, the method for calculating the charging duration provided by the embodiments of the present application is the estimated charging duration of the battery during the actual charging process.

[0064] Please refer to Figure 3 , Figure 3 , which is a schematic flowchart of the method for calculating the charging duration provided by the embodiments of the present application. The method includes the following steps:

[0065] Step A, obtain the charging parameters of the battery, and establish a charging model according to the charging parameters. The charging model includes multiple charging stages.

[0066] Among them, the charging parameters can be the charging parameters of the battery tested by an experimental method, or the charging parameters of the battery during the historical charging process. In some embodiments, the charging parameters include the charging current and the battery temperature; in other embodiments, the charging parameters include the charging current and the battery SOC; in still other embodiments, the charging parameters include the charging current, the battery temperature, and the battery SOC. Among them, SOC (State of Charge) is an index describing the current remaining power of the battery, usually shown in the form of a percentage.

[0067] It is understandable that the BMS module can obtain the charging parameters of the battery during historical charging processes. Specifically, the BMS module is provided with an AFE (Analog Front End), which is a series of circuits used to process analog signals in an electronic system. In the BMS module, the AFE is used to accurately measure parameters such as battery voltage and current, and convert these analog signals into digital signals for further processing and analysis.

[0068] For different batteries, their charging current ranges may vary. Batteries used in new energy vehicles are usually designed for high-power discharge and fast charging. Their charging current ranges can be from 0.2C to 0.5C for slow charging, up to 1C or higher for fast charging. The development of fast charging technology enables some batteries to be charged at higher currents, and may even reach 2C, 3C or higher to shorten the charging time. Here, "C" refers to the battery capacity. For example, a 100Ah battery charged at 1C has a charging current of 100A.

[0069] In contrast, for batteries used in energy storage systems for renewable energy such as solar, wind, and hydropower, they usually do not require fast charging like batteries used in new energy vehicles. Therefore, the charging current range for batteries used in energy storage systems is usually lower, and several charging currents may be set as follows: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C, and 0.1C.

[0070] Among them, the charging model is established based on the charging parameters. The charging model includes multiple charging stages, and each charging stage corresponds to a charging current after current limiting, and this charging current is the maximum safe charging current or the maximum allowable current. That is, each charging stage is divided according to the charging current. For example, the charging current in the first charging stage is I 1, the charging current in the second charging stage is I 2, the charging current in the third charging stage is I 3, the charging current in the n th charging stage is I n .

[0071] In some embodiments, the charging current is set according to the battery temperature. Please refer to Figure 4 , Figure 4 which shows an implementation form of the charging model. Specifically, the charging model includes a first model, and the first model is a relationship model established based on the charging current and the battery temperature, representing the relationship between the charging current and the battery temperature change.

[0072] The operating temperature range of the battery is typically from -20°C to 60°C. The preferred operating temperature range is from 0°C to 40°C. Within this range, the battery performs better and can achieve normal charge and discharge efficiency. When the battery is at a lower temperature (e.g., less than 25°C), the charging current (referred to as the temperature current in the first model) is usually set to a relatively high constant value (e.g., 1.2C) because the battery can withstand a relatively large charging rate without generating excessive heat or side reactions. When the temperature gradually rises (such as 25°C - 35°C), the temperature current needs to gradually decrease because the higher the temperature, the weaker the battery's acceptance ability, and the charging rate must be slowed down to avoid overcharging and the accumulation of internal pressure. When the battery approaches a high temperature (e.g., approaching 60°C), the temperature current will further decrease to a very low level.

[0073] As an example, in the first model, the temperature current ( I Tn ) can be set to the following currents: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C, and 0.1C.

[0074] In some other embodiments, the charging current is set according to the battery SOC. Please refer to Figure 5 , Figure 5 which shows another implementation form of the charging model. Specifically, the charging model includes a second model, which is a relationship model between the SOC current and the battery SOC established based on the charging current and the battery SOC, representing the relationship between the charging current and the change of the battery SOC.

[0075] When the battery is at a low SOC, the charging current (referred to as the SOC current in the second model) is usually set to a relatively high constant value (e.g., 1.2C) because the battery can withstand a relatively large charging rate without generating excessive heat or side reactions. When the battery SOC is larger (e.g., when the SOC reaches more than 80%), the SOC current needs to gradually decrease because the battery's acceptance ability weakens, and the charging rate must be slowed down to avoid overcharging and the accumulation of internal pressure. When the battery is close to being fully charged (SOC close to 100%), the SOC current will further decrease to a very low level, called trickle charging or floating charging, to keep the battery in a fully charged state without causing overcharging.

[0076] As an example, in the second model, the SOC current ( I SOCn ) can be set to the following currents: 1.2C, 1C, 0.8C, 0.5C, 0.3C, 0.2C, and 0.1C.

[0077] In still some other embodiments, the charging current is set according to the battery temperature and the battery SOC, and the first model and the second model as described above are established.

[0078] It should be noted that the charging stages in the first model may or may not be the same as those in the second model, and the theoretical temperature current corresponding to each charging stage in the first model may or may not be the same as the theoretical SOC current corresponding to each charging stage in the second model.

[0079] Step B: Obtain the current operating condition parameters of the battery in the current charging stage, and determine the stage charging current of the battery according to the current operating condition parameters and the charging model.

[0080] In some embodiments, when the charging model established in step A is the first model, obtaining the current operating condition parameters of the battery includes the starting battery temperature and the external input current limit in the current charging stage.

[0081] The external input current limit is the maximum charging current that can be input to the battery externally. For example, when charging the battery with a charger and the current of the charger is between 5A and 20A, the external input current limit is 20A.

[0082] The starting battery temperature refers to the starting moment of each charging stage after dividing the whole process into multiple charging stages. of the starting battery temperature .

[0083] In the first charging stage, the starting battery temperature is the battery temperature T0 actually sampled at the moment (t0 moment) for calculating the remaining charging duration of the battery; in the subsequent charging stages (the second charging stage, the third charging stage...), the starting battery temperature is calculated according to the relevant charging parameters of the previous charging stage. For specific details, see step E.

[0084] According to the starting battery temperature at the starting moment of the current charging stage of the starting battery temperature , and then according to the first model, the theoretical temperature current corresponding to the starting battery temperature can be determined corresponding to the theoretical temperature current . As Figure 4 shown, assuming the starting battery temperature is T3, then the corresponding theoretical temperature current is I T4 .

[0085] Take the smaller value of the theoretical temperature current and the external input current limit as the stage charging current of the battery.

[0086] In other embodiments, when the charging model established in step A is the second model, the current operating condition parameters obtained include the starting battery SOC and the external input current limit.

[0087] The starting battery SOC refers to the starting battery SOC for each charging stage after dividing the entire process into multiple charging stages.

[0088] In the first charging stage, the starting battery SOC is the battery SOC (SOC0) actually sampled at the moment (t0 moment) for calculating the remaining charging duration of the battery; in subsequent charging stages (the second charging stage, the third charging stage...), the starting battery SOC is calculated based on the stage charging current and relevant charging parameters of the previous charging stage. For specific content, see step S50.

[0089] According to the starting battery SOC at the starting moment of the current charging stage ), based on the second model, the theoretical SOC current corresponding to the starting battery SOC ( can be determined. ), as shown in . For example, Figure 5 shows that assuming the starting battery SOC is SOC3, its corresponding theoretical temperature current is I SOC4 .

[0090] Take the smaller value of the theoretical SOC current and the externally input current limit as the stage charging current of the battery.

[0091] In some other embodiments, when the charging model established in step A is the first model and the second model, the currently obtained operating condition parameters include the starting battery temperature, the starting battery SOC, and the externally input current limit.

[0092] According to the starting battery temperature at the starting moment of the current charging stage , based on the first model, the theoretical temperature current corresponding to the starting battery temperature can be determined ; according to the starting battery SOC ( ) at the starting moment of the current charging stage , based on the second model, the theoretical SOC current corresponding to the starting battery SOC can be determined ; take the minimum value of the theoretical temperature current , the theoretical SOC current , and the externally input current limit as the stage charging current of the battery.

[0093] The formula for the stage charging current is:

[0094]

[0095] Among them, the is the stage charging current, the is the theoretical SOC current, and the is the theoretical temperature current, and the is the external input current limit.

[0096] Step C: Determine the charging stage of the battery in the charging model according to the stage charging current of the battery, and determine relevant charging parameters.

[0097] According to the final stage charging current obtained in step B , it is necessary to re-determine the charging stage corresponding to the battery in the charging model. According to the corresponding charging stage in the charging model, relevant charging parameters of the current charging stage can be further obtained.

[0098] In some embodiments, according to the stage charging current of the battery , in combination with the first model, determine the charging stage of the battery in the first model, and determine first relevant charging parameters, where the first relevant charging parameters include: the cut-off battery temperature corresponding to the current charging stage . The cut-off battery temperature is the battery temperature when the stage charging current is cut off in the first model. As Figure 4 shown, assume that the stage charging current of the battery is I T3 , then the cut-off battery temperature is T3.

[0099] In some other embodiments, according to the stage charging current of the battery , in combination with the second model, determine the charging stage of the battery in the second model, and determine second relevant charging parameters, where the second relevant charging parameters include: the cut-off battery SOC ( ) corresponding to the current charging stage. The cut-off battery SOC is the battery SOC when the stage charging current is cut off in the second model. As Figure 5 shown, assume that the stage charging current of the battery is I SOC4 , then the cut-off battery SOC is SOC4.

[0100] In still some other embodiments, according to the stage charging current of the battery , while combining the first model and the second model, respectively determine the charging stage of the battery in the first model and the second model, and determine first relevant charging parameters and second relevant charging parameters. Assume that the stage charging current of the battery is I T3 , then the cut-off battery temperature obtained according to the first model is T3; and another assumption is that I T3 is the same as I SOC4 , then the cut-off battery SOC obtained according to the second model is SOC4.

[0101] Step D. Calculate the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters.

[0102] When the charging model includes the first model, in some embodiments, refer to Figure 6 , the step of calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters, i.e., step D includes steps D1 and D2.

[0103] Step D1. Obtain the battery temperature rise rate table, and obtain the temperature rise rate in the current charging stage according to the battery temperature rise rate table and the stage charging current.

[0104] Wherein, the temperature rise rate may be the temperature rise rate table shown in Table 1 below. This temperature rise rate table may be established based on the battery temperature and charging current measured under experimental conditions.

[0105] As an example, assume that the operable battery temperature range of the battery is divided into 5 segments, and the charging current is divided into 9 segments, then the corresponding temperature rise rates are obtained as shown in Table 1 below:

[0106] Table 1 Temperature rise rates of the battery under different charging currents in each battery temperature segment (°C)

[0107]

[0108] Figure 7 Shows the difference in the temperature rise rate of the battery under different currents in the same temperature segment. From Table 1 and Figure 7 , it can be seen that different battery temperatures and different charging currents correspond to different temperature rise rates. According to the starting battery temperature and the stage charging current, the temperature rise rate in the current charging stage can be calculated.

[0109] For example, by querying the temperature rise rate table (such as Table 1), it is obtained that the starting battery temperature in the current charging stage is in the temperature segment between, and the stage charging current I n is in the charging current between, then the calculation formula for the temperature rise rate in the current charging stage is:

[0110]

[0111] Wherein, the n is the temperature rise rate in the current charging stage, the is the temperature rise rate defined by the temperature segment and the charging current limit, the is the temperature segment and charging current a limited temperature rise rate, where the and are the two ends of the charging current range where the stage charging current is located, and the I n is the stage charging current.

[0112] Step D2, calculate the first duration according to the temperature rise rate, the starting battery temperature and the cut-off battery temperature.

[0113] The calculation formula for the first duration can refer to the following formula:

[0114]

[0115] where the is the first duration of the n th (current) charging stage, the is the cut-off battery temperature of the n th (current) charging stage, the is the starting battery temperature of the n th (current) charging stage, and the is when the battery pack is at ( , ), that is, the temperature rise rate corresponding to the n th (current) charging stage.

[0116] When the charging model includes the second model, in some other embodiments, please refer to Figure 8 , the step of calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters, that is, step D includes steps D3-D4.

[0117] Step D3, obtain the rated capacity of the battery.

[0118] The rated capacity of the battery refers to the minimum amount of electricity that the battery should be able to discharge under certain discharge conditions (such as at a certain temperature, discharge rate and cut-off voltage), usually expressed in ampere-hours or milliampere-hours. This indicator reflects the amount of electricity stored in the battery and is one of the important parameters for measuring the battery performance. In practical applications, the rated capacity of the battery is of great significance for determining the usage time and replacement cycle of the battery.

[0119] The specific value of the rated capacitance of the battery is preset in the battery, for example, set in the battery management system (BMS).

[0120] Step D4, calculate the second duration according to the rated capacity, the starting battery SOC, the cut-off battery SOC, and the stage charging current.

[0121] In some embodiments, when considering the charging efficiency of the battery, the second duration can be calculated according to the charging efficiency, the rated capacity, the starting battery SOC, the cut-off battery SOC, and the stage charging current.

[0122] In some embodiments, the calculation formula of the second duration can refer to the following formula:

[0123]

[0124] wherein, the is the second duration of the n th (current) charging stage, the is the cut-off battery SOC of the n th (current) charging stage, the is the starting battery SOC of the n th (current) charging stage, the rated is the rated capacity, the is the stage charging current of the n th (current) charging stage, and the is the charging efficiency.

[0125] In some embodiments, the calculation formula of the charging efficiency is:

[0126]

[0127] wherein, the η is the charging efficiency, the is the total discharge amount of the battery during the last full charge and full discharge process, and the is the total charge amount of the battery during the last full charge and full discharge process.

[0128] wherein, "the last time" refers to the last full charge and full discharge process closest to the current time.

[0129] wherein, both the total discharge amount during the last full charge and full discharge process and the total charge amount during the last full charge and full discharge process can be obtained from the battery management system (BMS).

[0130] In some embodiments, the total charge amount during the last full charge and full discharge process can be obtained by the ampere-hour integration method, and its calculation formula is:

[0131]

[0132] wherein, the Q CellAccumulateis the total charge amount during the last full charge and full discharge process of the battery, the t1 is the starting moment of charging, the t2 is the ending moment of charging, the I ( t ) is the current during the last full charge process.

[0133] For the total discharge amount during the last full charge and full discharge process, the calculation formula for the total charge amount during the last full charge and full discharge process above can be referred to.

[0134] It should be noted that in some embodiments, the charging efficiency can also be a preset fixed value, such as 96%, 97% or 98%.

[0135] It can be understood that in some embodiments, when calculating the second duration, the charging efficiency may not be introduced, that is, the second duration is calculated only based on the rated capacity, the starting battery SOC, the ending battery SOC and the stage charging current. And when the charging efficiency is introduced, it is more in line with the actual situation of battery charging, so the calculation of the second duration is more accurate.

[0136] When the charging model includes the first model and the second model, in still some other embodiments, the step of calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters, that is, step D, in addition to including steps D1 - D4, further includes step D5.

[0137] Step D5, taking the smaller value of the first duration and the second duration as the charging duration of the current charging stage.

[0138]

[0139] Among them, is the charging duration of the n th (current) charging stage, is the first duration of the n th (current) charging stage, is the second duration of the n th (current) charging stage.

[0140] It should be noted that taking Figure 4 and Figure 5Taking the first model and the second model shown as examples, when the first duration is shorter than the second duration, that is, the battery temperature will reach the next charging stage first, then the theoretical temperature current will also enter the next charging stage. Similarly, when the second duration is shorter than the first duration, that is, the SOC of the battery will reach the next charging stage first, then the theoretical charging current will also enter the next charging stage. Based on this, when the charging model includes the first model and the second model, the charging duration is taken as the minimum value of the first duration and the second duration.

[0141] After obtaining the charging duration of the battery in the current charging stage, the remaining charging duration of the battery can also be obtained accordingly.

[0142] When the charging model only includes the first model, the cut-off battery temperature at the current charging stage obtained in step C can be used as the starting battery temperature in the working condition parameters of the next charging stage.

[0143] When the charging model only includes the second model, the cut-off battery SOC at the current charging stage obtained in step C can be used as the starting battery SOC in the working condition parameters of the next charging stage.

[0144] When the charging model includes the first model and the second model, it is also necessary to correct the working condition data at the end of the current charging stage, and the corrected working condition parameters at the end of the current charging stage can be substituted into step A as the working condition parameters of the next charging stage.

[0145] When the charging model includes the first model and the second model, after step D, it further includes: step E, calculating the working condition parameters at the end of the current charging stage as the working condition parameters of the next charging stage according to the stage charging current, charging duration and related charging parameters of the current stage.

[0146] As Figure 9 shown, step E specifically includes E1 and E2.

[0147] Step E1. Calculate the cut-off battery temperature at the end of the current charging stage (i.e., the starting battery temperature of the next charging stage) according to the charging duration, starting battery temperature and temperature rise rate of the current charging stage. The calculation formula for the starting battery temperature of the next charging stage is:

[0148]

[0149] Where is the cut-off battery temperature at the end of the current charging stage, is the starting battery temperature at the start of the current charging stage, is the charging duration of the current charging stage, is the temperature rise rate of the current charging stage.

[0150] Step E2. Calculate the cut-off battery SOC at the end of the current charging stage (i.e., the starting battery SOC of the next charging stage) according to the starting battery SOC, stage charging current, charging duration, rated capacity of the battery, and charging efficiency in the current charging stage. The calculation formula for the starting battery SOC of the next charging stage is:

[0151]

[0152] where, is the cut-off battery SOC at the end of the current charging stage, is the starting battery SOC at the start of the current charging stage, is the stage charging current of the current charging stage, is the charging duration of the current charging stage, is the charging efficiency, is the rated capacity of the battery.

[0153] It can be understood that in some embodiments, when calculating the battery SOC at the end of the current charging stage, the charging efficiency may not be introduced. However, when the charging efficiency is introduced, it is more in line with the actual situation of battery charging, thus making the calculation more accurate.

[0154] After step E, there are also steps F and G:

[0155] Step F. Take the operating parameters at the end of the current charging stage as the operating parameters of the next charging stage, and loop through steps A - E until the battery temperature reaches the protection point or the battery SOC reaches the full charge threshold.

[0156] Among them, the protection point of the battery temperature can be selected as T = 60°C.

[0157] Among them, the full charge threshold can be selected as SOC = 100%, which means the battery is fully charged and has reached its maximum energy storage capacity. Then, in practical applications, especially for rechargeable batteries such as lithium - ion batteries, to protect the battery and extend its service life, the full charge threshold can be controlled to be close to 100% (such as SOC = 99% or 98%).

[0158] Step G. Accumulate the charging durations of the battery in each charging stage to obtain the remaining charging duration of the battery.

[0159] Record the remaining charging duration as and its calculation formula is:

[0160]

[0161] where, The charging duration for each charging stage.

[0162] To facilitate the reader's understanding of the inventive concept of the present application, a calculation method for the charging duration provided in the embodiments of the present application will now be described with a specific example:

[0163] Set the starting time t0 (the starting time of the first charging stage), the battery temperature T0 is 25 °C, the battery SOC (SOC0) is 20%, the external input current limit is 1.5C, and the charging efficiency is 95%.

[0164] According to the starting battery temperature T0 = 25 °C of the first charging stage, determine the theoretical temperature current corresponding to this temperature in the first model as ; and according to the starting battery SOC0 = 20% of the first charging stage, determine the theoretical SOC current corresponding to this SOC in the second model as . Combining with the external input current limit, it can be known that the stage charging current of the first charging stage is .

[0165] According to the finally determined stage charging current I 1 = 1.0C, re-determine the charging stage of the battery in the first model and the cut-off battery temperature corresponding to the current charging stage as 40 °C, and re-determine the charging stage of the battery in the second model and the cut-off battery SOC corresponding to the current charging stage as 80%.

[0166] The second charging duration of the first charging stage is , and its calculated value is:

[0167]

[0168] Determine that the battery temperature 25 is in the temperature range , and the limited charging current at this time is between . By querying the temperature rise rate table shown in Table 1, for example, the temperature rise rate corresponding to 0.8 C is 28 °C / h, and the temperature rise rate corresponding to 1.2 C is 34 °C / h. Then, for the calculated value of the temperature rise rate , according to the above currents 0.8 C , 1.2 C and , calculate the calculated value of the temperature rise rate as follows:

[0169]

[0170] Then the first charging duration of the first charging stage , and its calculated value is:

[0171]

[0172] The charging duration corresponding to the first charging stage of the battery is the minimum of the first charging duration and the second charging duration, as follows:

[0173]

[0174] It indicates that the battery temperature first enters the next charging stage at 40°C. Therefore, it is necessary to correct the cut-off battery SOC of the first charging stage (i.e., the starting battery SOC for entering the next charging stage). At this time, the cut-off SOC of the first charging stage is as follows:

[0175]

[0176] The cut-off battery temperature of the first charging stage can directly adopt the cut-off battery temperature of the first charging stage obtained by the above query model. It can also be calculated and verified according to the following formula:

[0177]

[0178] Taking this as the starting point for the next stage, repeat the calculation until the SOC reaches 100% or the battery temperature reaches the protection point, that is, stop charging, so as to cumulatively obtain the total remaining charging duration of the battery during the current charging process.

[0179] In the embodiment of the present application, the calculation method of the charging duration is applied to a battery system. The method includes: obtaining the charging parameters of the battery, establishing a charging model according to the charging parameters, and the charging model includes multiple charging stages; obtaining the current working condition parameters of the battery in the current charging stage, and determining the stage charging current of the battery according to the current working condition parameters and the charging model; determining the current charging stage and related charging parameters of the battery according to the stage charging current of the battery; calculating the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the related charging parameters. By establishing a model of the charging stage in the above method, dynamically capturing the change of the stage charging current caused by the change of the charging working condition, so as to accurately obtain the charging duration of the current charging stage and the total remaining charging duration, which is convenient for users to reasonably arrange their trips and improve the user experience. This method adapts to the phenomenon of charging working condition fluctuations caused by environmental temperature changes and battery SOC changes during the charging process, improves the prediction accuracy of the remaining charging time, and greatly improves the user experience.

[0180] Embodiment 4

[0181] Next, the calculation device for the charging duration provided in the embodiment of the present application will be discussed. Please refer to Figure 10, Figure 10 It is a schematic diagram of a charging duration calculation device provided by an embodiment of the present application. The charging duration calculation device 1 includes a first acquisition module 11, configured to acquire the charging parameters of the battery, and establish a charging model according to the charging parameters, where the charging model includes multiple charging stages; a second acquisition module 12, configured to acquire the current operating condition parameters of the battery in the current charging stage, and determine the stage charging current of the battery according to the current operating condition parameters and the charging model; a determination module 13, configured to determine the charging stage in which the battery is located in the charging model according to the stage charging current of the battery, and determine relevant charging parameters; and a calculation module 14, configured to calculate the charging duration of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters.

[0182] In some embodiments, in the first acquisition module 11, the charging parameters include a charging current and a battery temperature, and the charging model includes a first model, which is a relationship model established based on the charging current and the battery temperature; in the second acquisition module 12, the current operating condition parameters include a starting battery temperature and an external input current limit; the second acquisition module 12 is specifically configured to determine a corresponding theoretical temperature current according to the starting battery temperature and the first model, and use the smaller value of the theoretical temperature current and the external input current limit as the stage charging current of the battery; the determination module 13 includes a first determination unit 131, configured to determine the charging stage in which the battery is located in the first model according to the stage charging current of the battery, and determine first relevant charging parameters, where the first relevant charging parameters include: a cut-off battery temperature of the current charging stage; the calculation module 14 includes a first acquisition unit 141, configured to acquire a battery temperature rise rate table, and obtain a temperature rise rate of the current charging stage according to the battery temperature rise rate table, the starting battery temperature, and the stage charging current; and a first calculation unit 142, configured to calculate a first duration as the charging duration of the current charging stage according to the temperature rise rate, the starting battery temperature, and the cut-off battery temperature.

[0183] In some embodiments, in the first acquisition module 11, the charging parameters include the charging current and the battery SOC, the charging model includes a second model, and the second model is a relationship model established based on the charging current and the battery SOC; in the second acquisition module 12, the current working condition parameters include the starting battery SOC and the external input current limit; the corresponding theoretical SOC current is determined according to the starting battery SOC and the second model, and the smaller value of the theoretical SOC current and the external input current limit is used as the stage charging current of the battery; the determination module 13 includes a second determination unit 132, which is configured to determine the charging stage in which the battery is located in the second model according to the stage charging current of the battery, and determine second related charging parameters, where the second related charging parameters include: the cut-off battery SOC of the current charging stage; the calculation module 14 includes a second acquisition unit 143, which is configured to acquire the rated capacity of the battery; a second calculation unit 144, which is configured to calculate a second duration as the charging duration of the current charging stage according to the rated capacity, the starting battery SOC, the cut-off battery SOC, and the stage charging current.

[0184] In some embodiments, in the first acquisition module 11, the charging parameters include the charging current, the battery temperature, and the battery SOC, the charging model includes a first model and a second model, the first model is a relationship model established based on the charging current and the battery temperature, and the second model is a relationship model established based on the charging current and the battery SOC; in the second acquisition module 12, the current working condition parameters include the starting battery temperature, the starting battery SOC, and the external input current limit; the corresponding theoretical temperature current is determined according to the starting battery temperature and the first model, the corresponding theoretical SOC current is determined according to the starting battery SOC and the second model, and the minimum value of the theoretical temperature current, the theoretical SOC current, and the external input current limit is used as the stage charging current of the battery; the determination module 13 includes the first determination unit 131 and the second determination unit 132; the calculation module 14 includes the first acquisition unit 141, the first calculation unit 142, the second acquisition unit 143, the second calculation unit 144, and the third calculation unit 145, which is configured to use the smaller value of the first duration and the second duration as the charging duration of the current charging stage.

[0185] In some embodiments, the calculation module 14 is further configured to acquire the charging efficiency of the battery; calculate the second duration according to the charging efficiency, the rated capacity, the starting battery SOC, the cut-off battery SOC, and the stage charging current.

[0186] In some embodiments, the cut-off battery temperature at the current charging stage is equal to the starting battery temperature at the next charging stage. The charging duration calculation device 1 further includes a first correction module 15, configured to obtain the starting battery temperature, charging duration, and temperature rise rate at the current charging stage; and calculate the starting battery temperature at the next charging stage according to the starting battery temperature, charging duration, and temperature rise rate at the current charging stage.

[0187] In some embodiments, the cut-off battery SOC at the current charging stage is equal to the starting battery SOC at the next charging stage. The charging duration calculation device 1 further includes a second correction module 16, configured to obtain the stage charging current, charging duration, and starting battery SOC at the current charging stage; and calculate the starting battery SOC at the next charging stage according to the stage charging current, charging duration, and starting battery SOC.

[0188] In some embodiments, the charging duration calculation device 1 further includes an accumulation module 17, configured to obtain the charging durations of each charging stage to obtain a plurality of charging durations; and accumulate the plurality of charging durations to obtain the total remaining charging duration of the battery.

[0189] In the embodiments of the present application, the charging parameters of the battery are obtained through the first acquisition module 11, and a charging model is established according to the charging parameters. The charging model includes a plurality of charging stages; the current working condition parameters of the battery at the current charging stage are obtained through the second acquisition module 12, and the stage charging current of the battery is determined according to the current working condition parameters and the charging model; the charging stage in which the battery is located in the charging model is determined through the determination module 13 according to the stage charging current of the battery, and relevant charging parameters are determined; the charging duration of the battery at the current charging stage is calculated through the calculation module 14 according to the stage charging current of the battery and the relevant charging parameters. Then, the change in the stage charging current caused by the change in the charging working condition can be dynamically captured, so as to accurately obtain the charging duration and the total remaining charging duration at the current charging stage, which is convenient for the user to reasonably arrange the itinerary and improve the user experience. The device adapts to the phenomenon of charging working condition fluctuations caused by environmental temperature changes and battery SOC changes during the charging process, improves the estimation accuracy of the remaining charging time, and greatly improves the user experience.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other changes in different aspects of the present application as above. For the sake of brevity, they are not provided in detail; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A method for calculating charging time, characterized in that: Applied to a battery, the method comprises: Step A, acquiring charging parameters of the battery, establishing a charging model according to the charging parameters, wherein the charging model includes multiple charging stages; the charging parameters include charging current, battery temperature and battery SOC, and the charging model includes a first model and a second model, wherein the first model is a relationship model established based on the charging current and battery temperature, and the second model is a relationship model established based on the charging current and battery SOC; Step B, obtaining current operating condition parameters of the battery in the current charging stage, the current operating condition parameters including the starting battery temperature, the starting battery SOC and the external input current limit, determining the stage charging current of the battery according to the current operating condition parameters and the charging model, specifically determining the corresponding theoretical temperature current according to the starting battery temperature and the first model, determining the corresponding theoretical SOC current according to the starting battery SOC and the second model, and taking the minimum of the theoretical temperature current, the theoretical SOC current and the external input current limit as the stage charging current of the battery; Step C, determining the charging stage of the battery in the charging model according to the stage charging current of the battery, and determining related charging parameters; the step C specifically determines the charging stage of the battery in the first model according to the stage charging current of the battery, and determines the first related charging parameter, the first related charging parameter includes: the cut-off battery temperature corresponding to the current charging stage; determining the charging stage of the battery in the second model according to the stage charging current of the battery, and determining the second related charging parameter, the second related charging parameter includes: the cut-off battery SOC corresponding to the current charging stage; Step D, calculating the charging time of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters; the specific steps of step D are to obtain a battery temperature rise rate table, and obtain the temperature rise rate of the current charging stage according to the battery temperature rise rate table, the starting battery temperature and the stage charging current; calculate a first time according to the temperature rise rate, the starting battery temperature and the ending battery temperature; obtain the rated capacity of the battery; calculate a second time according to the rated capacity, the starting battery SOC, the ending battery SOC and the stage charging current; and use the smaller of the first time and the second time as the charging time of the current charging stage.

2. The method according to claim 1, characterized in that The step D also includes obtaining the charging efficiency of the battery; The second duration is calculated according to the charging efficiency, the rated capacity, the starting battery SOC, the ending battery SOC and the stage charging current.

3. The method according to claim 1, characterized in that The calculation formula of the first duration is: Among them, the is the first duration of the current charging stage, is the cut-off battery temperature of the current charging stage, is the starting battery temperature of the current charging stage, is the temperature rise rate corresponding to the current charging stage; Among them, the For the temperature range and charging current The temperature rise rate is limited to For the temperature range and charging current The temperature rise rate is limited to I n is the charging current of the current charging stage, and For the I n The two ends of the charging current range.

4. The method according to claim 3, characterized in that The end battery temperature of the current charging stage is equal to the start battery temperature of the next charging stage. The method for obtaining the start battery temperature of the next charging stage includes: Get the starting battery temperature, charging time and temperature rise rate of the current charging stage; The starting battery temperature of the next charging stage is calculated according to the starting battery temperature, charging time and temperature rise rate of the current charging stage.

5. The method according to claim 4, characterized in that The calculation formula for the starting battery temperature of the next charging stage is: in, is the starting battery temperature for the next charging stage, is the starting battery temperature at the beginning of the current charging phase, is the charging time of the current charging stage, is the temperature rise rate in the current charging stage.

6. The method according to claim 2, characterized in that The calculation formula of the second duration is: Among them, the is the second duration of the current charging stage, is the cut-off battery SOC of the current charging stage, is the starting battery SOC of the current charging stage, The rated capacity is the rated capacity, is the charging current of the current charging stage, is the charging efficiency.

7. The method according to claim 6, characterized in that The end battery SOC of the current charging stage is equal to the start battery SOC of the next charging stage. The method for obtaining the start battery SOC of the next charging stage includes: Get the stage charging current, charging time and starting battery SOC of the current charging stage; The starting battery SOC of the next charging stage is calculated according to the charging current, charging time and starting battery SOC of the stage.

8. The method according to claim 7, characterized in that The calculation formula of the starting battery SOC of the next charging stage is: in, is the cut-off battery SOC at the end of the current charging stage, is the starting battery SOC at the beginning of the current charging phase, is the charging current of the current charging stage, is the charging time of the current charging stage, For charging efficiency, is the rated capacity of the battery.

9. A method for calculating the total remaining charging time of a battery, characterized in that: The method comprises: According to the charging duration calculation method according to any one of claims 1 to 8, the charging duration of each charging stage is obtained to obtain multiple charging durations; The multiple charging time periods are accumulated to obtain a total remaining charging time period of the battery.

10. A charging time calculation device, characterized in that: Applied to a battery, the device comprises: A first acquisition module, used for acquiring charging parameters of the battery, and establishing a charging model according to the charging parameters, wherein the charging model includes a plurality of charging stages; wherein the charging parameters include charging current, battery temperature and battery SOC, and the charging model includes a first model and a second model, wherein the first model is a relationship model established based on the charging current and battery temperature, and the second model is a relationship model established based on the charging current and battery SOC; a second acquisition module, used to acquire current operating condition parameters of the battery in a current charging stage, the current operating condition parameters including a starting battery temperature, a starting battery SOC and an external input current limit, and determine a stage charging current of the battery according to the current operating condition parameters and the charging model; the second acquisition module is specifically used to determine a corresponding theoretical temperature current according to the starting battery temperature and the first model, determine a corresponding theoretical SOC current according to the starting battery SOC and the second model, and use the minimum of the theoretical temperature current, the theoretical SOC current and the external input current limit as the stage charging current of the battery; A determination module, which determines the charging stage of the battery in the charging model according to the stage charging current of the battery, and determines relevant charging parameters; the determination module is specifically used to determine the charging stage of the battery in the first model according to the stage charging current of the battery, and determine the first relevant charging parameter, the first relevant charging parameter includes: the cut-off battery temperature corresponding to the current charging stage; according to the stage charging current of the battery, determine the charging stage of the battery in the second model, and determine the second relevant charging parameter, the second relevant charging parameter includes: the cut-off battery SOC corresponding to the current charging stage; A calculation module is used to calculate the charging time of the battery in the current charging stage according to the stage charging current of the battery and the relevant charging parameters; the calculation module is specifically used to obtain a battery temperature rise rate table, and obtain the temperature rise rate of the current charging stage according to the battery temperature rise rate table, the starting battery temperature and the stage charging current; calculate a first time according to the temperature rise rate, the starting battery temperature and the ending battery temperature; obtain the rated capacity of the battery; calculate a second time according to the rated capacity, the starting battery SOC, the ending battery SOC and the stage charging current; and use the smaller of the first time and the second time as the charging time of the current charging stage.

11. A battery system, characterized in that: include: at least one processor; as well as A memory, wherein the memory is communicatively connected to the at least one processor, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor performs the steps of the method according to any one of claims 1 to 9.

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